MAGNETIC G-FACTOR OF ELECTRONS IN GAAS ALXGA1-XAS QUANTUM-WELLS

Article

关键词: CYCLOTRON-RESONANCE;    SPIN-RESONANCE;    HETEROSTRUCTURES;    HETEROJUNCTIONS;    ENHANCEMENT;    EXCITONS;    ALLOYS;    GAINAS;    GAS;   

DOI  :  10.1103/PhysRevB.44.11345

来源: SCIE

【 摘 要 】

The magnitude and sign of the effective magnetic splitting factor g* for conduction electrons in GaAs/AlxGa1-xAs quantum wells have been determined as a function of well width down to 5 nm. The experimental method is based on combined measurements of the decay time of photoluminescence and of the suppression of its circular polarization under polarized optical pumping in a magnetic field perpendicular to the growth axis (Hanle effect). Measurements as a function of hole sheet density in the wells reveal a transition from excitonic behavior with very small apparent g value for low density, to larger absolute values characteristic of free electrons at higher densities. For 20-nm wells g* for electrons is close to the bulk value (-0.44), and increases for narrower wells passing through zero for well width close to 5.5 nm. A theoretical analysis based on three-band k.p theory, including allowance for conduction-band nonparabolicity and for wave-function penetration into the barriers, gives a reasonable representation of the data, leading to the conclusion that g* in quantum wells has a value close to that of electrons in the bulk at the confinement energy above the band minimum.

【 授权许可】

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